Which of these relations is a function?

Bottom right

Step-by-step explanation:

A relation cannot be a function if it has two points both on the same x-value, so we can look at the relations and determine that the bottom-right answer is the only one that follows the aforementioned rule.

The graph of the straight line (segment)

Step-by-step explanation:

looks at the vertical grid lines

Those graphs that touch more than one point along each of those lines are not functions.

Only one graph corresponds to a function, it is the last one.

Hope this helps